Raphael Mechoulam (Hebrew: רפאל משולם‎) (born 1930) is an Israeli organic chemist and professor of Medicinal Chemistry at the Hebrew University of Jerusalem in Israel. Mechoulam is best known for his work (together with Y. Gaoni) in the isolation, structure elucidation and total synthesis of Δ9-tetrahydrocannabinol, the main active principle of cannabis and for the isolation and the identification of the endogenous cannabinoids anandamide from the brain and 2-arachidonoyl glycerol (2-AG) from peripheral organs together with his students, postdocs and collaborators.
Raphael Mechoulam's major scientific interest is the chemistry and pharmacology of cannabinoids. He and his research group succeeded in the total synthesis of the major plant cannabinoids Δ9-tetrahydrocannabinol, cannabidiol, cannabigerol and various others. Another research project initiated by him led to the isolation of the first described endocannabinoid anandamide which was isolated and characterized by two of his postdoctoral researchers, Lumír Ondřej Hanuš and William Devane. Another endogenous cannabinoid, 2-AG, was soon discovered by Shimon Ben-Shabat, one of his PhD students. He published more than 350 scientific articles.

reference:

https://en.wikipedia.org/wiki/Raphael_Mechoulam